CN209815993U - Butanol pre-purification system for preparing n-butyl acetate - Google Patents
Butanol pre-purification system for preparing n-butyl acetate Download PDFInfo
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- CN209815993U CN209815993U CN201920188709.7U CN201920188709U CN209815993U CN 209815993 U CN209815993 U CN 209815993U CN 201920188709 U CN201920188709 U CN 201920188709U CN 209815993 U CN209815993 U CN 209815993U
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Abstract
The utility model discloses a butanol pre-purification system for preparing n-butyl acetate, which comprises a decolorizer, a rectifying tower, a heat exchanger and a reboiler; one end of the decolorizer is communicated with a butanol raw material tank, the other end of the decolorizer is communicated with a rectifying tower, and the outlet end of the rectifying tower is connected to the esterification reaction unit through a pipeline; the lower part of the decolorizer is provided with a raw material feed inlet which is communicated with a butanol raw material tank through a raw material feed pipe; a decolorant feed port is formed in the middle of the decolorant device and is communicated with a decolorant storage tank through a decolorant feed pipe; a discharge port of the decolorant is arranged at the upper part of the decolorant and communicated to a middle feed port of the rectifying tower through a discharge pipe; an outlet at the top end of the rectifying tower is connected with a feed inlet of a heat exchanger, and a discharge outlet of the heat exchanger is connected with a reflux tank. The utility model discloses a serialization production, the discharge rate is high, the material loss is little, and does not introduce mechanical impurity, and greatly reduced purification energy consumption does benefit to the expansion of mill's productivity.
Description
Technical Field
The utility model relates to a butanol system of purifying in advance for preparation of n-butyl acetate belongs to chemical production technical field.
Background
N-butyl acetate is an important organic solvent, extractant and dehydrator, has wide application in industry, and is mainly used in the industries of collodion, nitrocellulose, varnish, artificial leather, medicine, plastics and spice; it is mainly used as solvent in the course of processing artificial leather, fabric and plastics, as extracting agent in the course of various petroleum processing and pharmacy, and as compounding component in various flavouring agents.
Currently, the industrial preparation method of n-butyl acetate generally adopts an esterification method, i.e. glacial acetic acid and n-butanol are adopted in a batch reactor to carry out esterification reaction under the catalysis of concentrated sulfuric acid to generate n-butyl acetate. In the production process of industrial grade butanol, the industrial grade butanol is often in a certain color due to the existence of impurities, and the direct esterification of the butanol can influence the chromaticity of butyl acetate product and the downstream use; therefore, butanol is often pre-purified to remove colored impurities prior to esterification. The prior pre-purification system mostly adopts physical purification, butanol is decolorized by adding a flocculating agent, active carbon and the like, and specifically, the steps of flocculation, adsorption, filter pressing and the like are carried out, the process is long, equipment is complex, mechanical impurities are easily brought into a subsequent reaction unit, the material loss is as high as 3.5 percent, intermittent operation is adopted, the discharge rate is only 2.65t/h, the requirement of industrial continuous production cannot be met, and further expansion of the production capacity of a factory is severely restricted.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to prior art's defect and not enough, provide a butanol system of purifying in advance for n-butyl acetate preparation, this system material loss is little, purification is effectual, adopts continuous type ejection of compact, the discharge rate improves greatly.
In order to achieve the above object, the utility model adopts the following technical scheme:
a butanol pre-purification system for preparing n-butyl acetate comprises a decolorizer, a rectifying tower, a heat exchanger and a reboiler; one end of the decolorizer is communicated with a butanol raw material tank, the other end of the decolorizer is communicated with a rectifying tower, and the outlet end of the rectifying tower is connected to the esterification reaction unit through a pipeline; the lower part of the decolorizer is provided with a raw material feed inlet which is communicated with a butanol raw material tank through a raw material feed pipe; a decolorant feed port is formed in the middle of the decolorant device and is communicated with a decolorant storage tank through a decolorant feed pipe; a discharge port of the decolorant is arranged at the upper part of the decolorant and communicated to a middle feed port of the rectifying tower through a discharge pipe; an outlet at the top end of the rectifying tower is connected with a feed inlet of a heat exchanger, and a discharge outlet of the heat exchanger is connected with a reflux tank.
The utility model discloses a further improvement lies in: the decolorant inlet pipe is communicated with the spray pipe after entering the decolorant shell, the liquid distributor and the packing layer are sequentially arranged below the spray pipe, and the horizontal stirrer is arranged below the packing layer and above the raw material inlet pipe.
The utility model discloses a further improvement lies in: and a liquid outlet at the bottom of the rectifying tower is communicated to a tube pass inlet of the reboiler, and a tube pass outlet of the reboiler is communicated to a secondary feed inlet in the middle of the rectifying tower.
The utility model discloses a further improvement lies in: the feeding device is characterized in that a first driving pump is arranged on the raw material feeding pipe, a second driving pump is arranged on the decolorant feeding pipe, a third driving pump is arranged on the discharging pipe, and a fourth driving pump is arranged on the feeding pipe.
The utility model discloses a further improvement lies in: bypass pipes are arranged on the raw material feeding pipe, the decolorant feeding pipe, the first discharging pipe, the second discharging pipe and the condensed water discharging pipe, and are arranged at the outlet end of the pipeline driving pump.
The utility model discloses a further improvement lies in: the first driving pump and the second driving pump are flow control pumps.
The utility model discloses a further improvement lies in: the top of the decolorant is also provided with an emptying valve for emptying pressure in time, and the bottom of the decolorant is provided with a drain valve.
Since the technical scheme is used, the beneficial effects of the utility model reside in that:
the utility model provides a butanol system of purifying in advance for preparation of n-butyl acetate adopts serialization production, can be for the workshop section of esterifying constantly provides the reaction raw materials, and the discharge rate is high, and the extraction volume of rectifying column can reach 3t/h, is enough to satisfy the further expansion of mill's productivity. The system has short flow, less equipment and less material loss, and the loss of the n-butyl alcohol in normal operation of the system is less than 0.3 percent through tests, mechanical impurities can not be introduced, the reaction effect of a subsequent esterification unit is further ensured, the energy consumption in the purification process of the n-butyl alcohol is greatly reduced, and the requirement of clean production is met.
The utility model discloses simplified flow equipment, the very big operation degree of difficulty of having simplified, workman's working strength is showing and is improving, and the production security also improves greatly.
Drawings
Fig. 1 is a schematic connection diagram of the present invention;
FIG. 2 is a schematic diagram of the internal structure of the decolorizer;
1. butanol head tank, 2, decolorant storage tank, 3, decolorant, 31, shower, 32, distributor, 33, packing layer, 34, agitator, 4, rectifying column, 5, heat exchanger, 6, reflux drum, 7, reboiler, 8, raw materials inlet pipe, 9, decolorant inlet pipe, 10, discharging pipe, 11, conveying pipe, 12, comdenstion water discharge pipe, 13, first driving pump, 14, second driving pump, 15, third driving pump, 16, fourth driving pump, 17, atmospheric valve, 18, blowoff valve.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings.
A butanol pre-purification system for preparing n-butyl acetate is shown in figure 1 and comprises a decolorizer 3 communicated with a butanol raw material tank 1 and a rectifying tower 4 communicated with the decolorizer 3, wherein the outlet end of the rectifying tower 4 is connected to an esterification unit through a pipeline.
A raw material feeding port is formed in the lower portion of the decolorizer 3 and is communicated with a butanol raw material tank 1 through a raw material feeding pipe 8, a decolorizer feeding port is formed in the middle of the decolorizer 3 and is communicated with a decolorizer storage tank 2 through a decolorizer feeding pipe 9; the discharge port of the decolorant is arranged at the upper part of the decolorant and is communicated with the middle feed port of the rectifying tower 4 through a discharge pipe 10. The decoloring agent feeding pipe 9 is communicated with a spray pipe 31 after entering the shell of the decoloring device 3, the spray pipe 31 is a horizontal double-row pipeline, a plurality of spray holes with certain aperture ratio are arranged below the spray pipe 31, and the liquid decoloring agent is sprayed out of the spray holes in a micro-droplet shape so as to be in full contact with butanol; a liquid distributor 32 and a packing layer 33 are sequentially arranged below the spray pipe 31, a transverse stirrer 34 is arranged below the packing layer 33 and above the raw material feeding pipe 8, a stirring motor is positioned on the side wall of the decolorant 3, a stirring rod penetrates through the side wall, and a plurality of stages of stirring blades are arranged on the stirring rod. The liquid distributor 32 is a trough-tray distributor with a fixed opening ratio, so that the mass transfer efficiency between liquids can be greatly increased, the interphase contact is improved, and the uniform distribution of two-phase liquids is ensured; the agitator 34 can enhance the mixing uniformity below the decolorizer 3.
The top of the decolorizer 3 is also provided with an emptying valve 17 for emptying the pressure in the decolorizer 3; the bottom of the device is provided with a drain valve 18, and the salts generated in the neutralization process sink into the bottom of the decolorizer 3 and are discharged through the drain valve after deposition.
In order to realize the flowing of the butanol raw material and the decolorizing agent, a first driving pump 13 is arranged on the raw material feeding pipe 8, a second driving pump 14 is arranged on the decolorizing agent feeding pipe 9, and a third driving pump 15 is arranged on the discharging pipe 10.
The middle feed inlet of the rectifying tower 4 is communicated with the discharge outlet of the decolorant 3, the top outlet of the rectifying tower is communicated with the feed inlet of the heat exchanger 5, the discharge outlet of the heat exchanger 5 is connected to the reflux tank 6, the reflux tank 6 is directly communicated to an esterification unit for preparing n-butyl acetate through a feed pipe 11, and a fourth drive pump 16 is arranged on the feed pipe 11. And a coil pipe type cooling pipe is arranged in the heat exchanger 5, and two ends of the cooling pipe are respectively communicated with an upper cooling water pipe and a return cooling water pipe.
A liquid outlet positioned at the bottom of the rectifying tower 4 is communicated to a tube pass inlet of the reboiler 7, and a tube pass outlet of the reboiler 7 is communicated to a secondary feed inlet in the middle of the rectifying tower 4; the shell pass inlet of the reboiler 7 is connected with a steam pipeline of a factory, and the shell pass outlet is connected with a condensed water discharge pipe 12.
Further, an emptying valve 17 at the top of the decolorizer 3 is a full-automatic self-opening emptying valve, and once the pressure in the decolorizer 3 exceeds the standard, the pressure is released by opening immediately.
Furthermore, bypass pipes are respectively arranged on the raw material feeding pipe 8, the decolorant feeding pipe 9, the discharging pipe 10, the feeding pipe 11 and the condensed water discharging pipe 12, and are respectively arranged at the outlet end of the pipeline driving pump.
Further, the first driving pump 13 and the second driving pump 14 are flow control pumps, which can realize the quantitative addition of butanol and the decolorizing agent.
The utility model discloses a working process does:
butanol in a butanol raw material tank is continuously pumped to the lower part of a decolorizer by a first driving pump, meanwhile, a decolorizer is continuously pumped to the middle part of the decolorizer by a second driving pump, under the stirring action, the butanol is in cross-flow contact with the decolorizer and fully reacts with the decolorizer, and the reacted butanol is discharged from an outlet at the upper part of the decolorizer and enters a rectifying tower for steam stripping rectification;
butanol is heated and vaporized in the rectifying tower, high-purity steam gradually rises, is extracted from the top of the rectifying tower, is condensed into liquid in a heat exchanger, enters a reflux tank for temporary storage, and is pumped into an esterification unit for reaction; the low-temperature butanol which does not reach the boiling point enters the reboiler from the bottom of the tower, absorbs heat from steam through partition wall heat exchange, is continuously vaporized and rises back to the rectifying tower after being heated to reach the boiling point, and simultaneously, the low-temperature material in the tower kettle continuously and automatically flows into the reboiler to be supplemented and heated, so that strong internal circulation is formed in the rectifying tower and the reboiler, and the heated separation efficiency of the n-butanol is improved.
The above description is only for the purpose of illustrating the technical solutions of the present invention and not for the purpose of limiting the same, and other modifications or equivalent replacements made by those of ordinary skill in the art to the technical solutions of the present invention should be covered within the scope of the claims of the present invention as long as they do not depart from the spirit and scope of the technical solutions of the present invention.
Claims (7)
1. A butanol pre-purification system for n-butyl acetate preparation which characterized in that: comprises a decolorizer (3), a rectifying tower (4), a heat exchanger (5) and a reboiler (7); one end of the decolorizer (3) is communicated with the butanol raw material tank (1), the other end of the decolorizer is communicated with the rectifying tower (4), and the outlet end of the rectifying tower (4) is connected to the esterification reaction unit through a pipeline; a raw material feeding hole is formed in the lower portion of the decolorizer (3) and communicated with a butanol raw material tank (1) through a raw material feeding pipe (8); a decoloring agent feed port is formed in the middle of the decoloring device (3), and is communicated with the decoloring agent storage tank (2) through a decoloring agent feed pipe (9); a discharge hole of the decolorant (3) is arranged at the upper part of the decolorant (3) and is communicated to a middle feed hole of the rectifying tower (4) through a discharge pipe (10); the top end outlet of the rectifying tower (4) is connected with the feed inlet of the heat exchanger (5), and the discharge hole of the heat exchanger (5) is connected with the reflux tank (6).
2. A butanol prepurification system for the production of n-butyl acetate as defined in claim 1 wherein: the decolorizing agent feeding pipe (9) is communicated with the spray pipe (31) after entering the shell of the decolorizing device (3), the liquid distributor (32) and the packing layer (33) are sequentially arranged below the spray pipe (31), and the horizontal stirrer (34) is arranged below the packing layer (33) and above the raw material feeding pipe (8).
3. A butanol prepurification system for the production of n-butyl acetate as defined in claim 2 wherein: the top of the decolorant (3) is also provided with an emptying valve (17) for emptying pressure in time, and the bottom of the decolorant is provided with a drain valve (18).
4. A butanol prepurification system for the production of n-butyl acetate as defined in claim 1 wherein: and a liquid outlet at the bottom of the rectifying tower (4) is communicated to a tube pass inlet of the reboiler (7), and a tube pass outlet of the reboiler (7) is communicated to a secondary feed inlet in the middle of the rectifying tower (4).
5. A butanol prepurification system for the production of n-butyl acetate as defined in claim 1 wherein: the decolourant feeding device is characterized in that a first driving pump (13) is arranged on the raw material feeding pipe (8), a second driving pump (14) is arranged on the decolourant feeding pipe (9), a third driving pump (15) is arranged on the discharging pipe (10), and a fourth driving pump (16) is arranged on the feeding pipe (11).
6. A butanol prepurification system for the production of n-butyl acetate as defined in claim 5 wherein: bypass pipes are arranged on the raw material feeding pipe (8), the decolorant feeding pipe (9), the discharging pipe (10), the feeding pipe (11) and the condensed water discharging pipe (12), and are arranged at the outlet end of the pipeline driving pump.
7. A butanol prepurification system for the production of n-butyl acetate as defined in claim 5 wherein: the first driving pump (13) and the second driving pump (14) are flow control pumps.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920188709.7U CN209815993U (en) | 2019-02-10 | 2019-02-10 | Butanol pre-purification system for preparing n-butyl acetate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920188709.7U CN209815993U (en) | 2019-02-10 | 2019-02-10 | Butanol pre-purification system for preparing n-butyl acetate |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209815993U true CN209815993U (en) | 2019-12-20 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920188709.7U Active CN209815993U (en) | 2019-02-10 | 2019-02-10 | Butanol pre-purification system for preparing n-butyl acetate |
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| Country | Link |
|---|---|
| CN (1) | CN209815993U (en) |
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2019
- 2019-02-10 CN CN201920188709.7U patent/CN209815993U/en active Active
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